Double Commander extension file
Based on Midnight Commander 3.0 extension file

All lines starting with # or empty lines are thrown away.
All actions for file is showed in "Actions" submenu of file context popup menu

File format:

[extension1|extension2|...|extensionX]
Name=Category name
Icon=Path to icon
action1=command1
action2=command2
actionX=commandX

Where:

[extension] or [extension1|extension2 ...] - list of extensions (case insensitive !!no regular expression!!)
Also you can use "default" keyword as extension. In this case, if command had not found for sought file type, then will be used command from this section.

Name - Name of this category (showed in file association manager)

Icon - Path to icon that displays for this file types in file panel

Action can be:
  Open - used with tap on Enter or DblClick
  View - used with tap on F3
  Edit - used with tap on F4
  other actions only is showed in "Actions" submenu of file context popup menu

Command is any one-line shell command, with the simple macro substitution.

Macros should be (case sensitive):
  {!VFS}    - for archives - use virtual file system
  {!EDITOR} - call editor (internal or external by configuration}
  {!VIEWER} - call viewer (the same)
  {!SHELL}  - use shell from configuration to execute program (see mplayer)
  <?command?> - execute 'command' in system shell and save stdout output to file and transfer it as parameter to previous command (see rpm for example...)
  %f - filename
  %d - directory
  %p - path(directory+filename)